SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579656da9a4737cb9ca64535a0888ac737aff7b4c301fbfa0765e6b36dd518f1' 
  AND token = 'cnqMsB2TQtUZtMlqz7cvG2SUzD/ph+ZxUxO/Mgsf4QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}