SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89054b21c4a4492cdbc46385d6ea59aea882d13aa8554001d97f147c9f7411ee' 
  AND token = 'xGmJSWPuoV2Q0xQJfwPt6jphCZByzlxO8/DlAJsICQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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