Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca58b4b03fa6fd0de1eacf308db55333b50ba17b505a65a4bd2b225426ed3fb' 
  AND token = 'csHMjfLukf86xKiYNT5rjibgLe2hsTUpNOnLNwra4t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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