SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d954ffcc79c72b5cba7487f2d60cb37866273de72bce07ac261b64f6e6f522' 
  AND token = 'sMRKXToZbFJF9fzJEkRK/heLdOwBT19mRr0f1NFpmdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

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