Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4973c081ddf730a6102b91bb6a573b449b75f1ab0d066b360dff09e1a4e775' 
  AND token = 'WELFLo9RwvzBz0eZyy6ZFscP8gi5cbgsUyDwUJRARvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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