SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c890715a8eef5b3ffe1f203de91d62a39d3bd878a672121c2f41a4d96724562e' 
  AND token = 'OzBj2+D7N7eWZYVOxjKvzynKz6E0x5iB8IOlqg7qcYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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