Scopus provide a spreadsheet of journals which they index, or have indexed in the past. It is linked from this page. I have downloaded the spreadsheet, and in your case, the journal is specifically highlighted as no longer being indexed as they "do not meet the Scopus quality criteria anymore and therefore Scopus discontinued the forward capturing". However, if your paper was published in the range of time that the journal was indexed (2009-2015 according to the same spreadsheet), then it will still be in Scopus. You can confirm this by searching for it in the index.
The same Scopus page indicates that if you cannot find a journal in that spreadsheet, you can try searching Scopus for the name of the journal to see if any recent material has been indexed. As a last resort, you can contact Scopus.