SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb56ec64cd2533ef77993c436dabeac63e5609373d56434b8b1acf51b42beae6' 
  AND token = 'nJpGt1h6cVhu54KyBj0m6w01q28Crk/o9dKOA8hOc3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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