SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61552091b25ca38f34ffd67b2bf6ffce2d8c264740799ea7536ea5e1bc7972c4' 
  AND token = '4Y3gvli2yFk9KxhAXlC6dT9pEQNoZQHJqVg34JrMAhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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