SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c72782aa121eb73812051e0afd63441fb1cb45b740cc09c188b90c95fc3ee2' 
  AND token = 'MNtTj9cmXSNPOjcqJP734LrmBeH0bRfs/lKOeC7hly4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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