MiMiddleware.php

<?php

namespace App\Http\Middleware;

use Closure;

class MiMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $ruta = $request->route()->getName();
        if($ruta === "descargar_lista_precios"){
          # Ok, que pase
          return $next($request);
        } else {
          // Permiso denegado
          abort(403);
        }
    }
}