SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a0fd7b30261aa28125e83fd0e68f9a674b4e95dcbbba222750563ead68960d' 
  AND token = 'bBjVTw/5sVh6YhAuNxFVQZPVBpt2wsFQPvSxMdILers=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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