SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61ef26384985a26ce4abaf20bc546fc4e3d58a5439c0bab5cfd7ad4b6125176' 
  AND token = 'MPofeDJw97W09azJqtdvJdLjNA1vMyb//CV1gHBVYpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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