Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a555e162a036383b36e60f2bea92f1d8b60905996330f8238e1c25da9e888a1' 
  AND token = '79bcbBt1TJKpZHEyRUOUCad24oNVpfhpwjvGRkrDUL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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