SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22743cac16d41e1d5aa086dc2a6833f98788f80fc0c2d9fa5d9da68384883493' 
  AND token = 'G+eZ0JwnyDDmEidu4z2dYZW4Dw6hsZiXYZxuAIp5QJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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