SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364fa3a7267b191e14ae692fb66f155889bc9b767aa25f572ccaa440c43a70b2' 
  AND token = 'YQiAsb6oqKQjDq1J7U+UDyraBCoRlX+8bLvQtQPrzwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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