SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affa11d785467917760961e8c27be52dda118020d3d8efb56596dbbf70ceb205' 
  AND token = 'gXlufp63jOmjOcj1rOnJeu+psdtn5DwnjADXqKf5Azk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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