SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dca7d1ecf4b654500f3158f222c447a4507e326c969da31dc8f982fc76147c4' 
  AND token = '2munCUbf+XYNF1IOCdGIPowJ7Gz8s3dkcvDKe9UJUMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables