Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a43d00008c9c4fa191228c4ce9159cf7834016c763d944254165f71edd287efa' 
  AND token = '8/35SvGN07uaCml3+Kr2kXsJsj1e2/JLxiIg1gLgnyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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