Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e203405cd638b6e9fec87f0dd8b8ed9babb55d274159de30017e2c6ad757c18' 
  AND token = 'a/2+URxAYF0duYWkfFUsfFU0e0TW4oD8ur/xLaKhF0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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