Search Scopus for the journal. If you don't find it, it's not indexed.

Scopus coverage years:from 2018 to 2021

This means the journal was indexed by Scopus from 2018 to 2021. So as of 2022, it's not indexed. Journals can and are delisted from Scopus, for various reasons.

What should I do now? I have paid the registration fee also.

Journals don't have registration fees so it's unclear what you are asking. If you are referring to the article processing charge for open access publications, you could withdraw your paper, but this will likely cause bad blood with the journal because it feels like you're wasting their time and resources. In the future, if being indexed by Scopus is important to you, check if the journal is indexed before submitting. If delisting happened during the review process, you should still withdraw your article before paying the APC.

Search Scopus for the journal. If you don't find it, it's not indexed.

Edit: the journal in question is indexed by Scopus, but it doesn't have any 2022 articles. I'm guessing that's why the Scopus coverage years are only 2018-2021. 2022 articles will be indexed eventually, just not yet.