SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff9fd1e80d815a1a3c99522862ab8124087cff2087308d7a18fb7776d52b226' 
  AND token = 'sBk553zf4TMiCPjbAdOEKAEEGempffr+/FTVdjn7W78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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