I found the solution. Just add new line in jquery script:
$(document).ready(function () {
$("#subregion-id").bind("change",
function (event) {
$.ajax({
async:true,
data: $("#subregion-id").serialize(),
dataType:"html",
beforeSend: function (xhr) { // Add this line
xhr.setRequestHeader('X-CSRF-Token', $('[name="_csrfToken"]').val());
}, // Add this line
success:function (data, textStatus) {
$("#municipio-id").html(data);
},
type:"post", url:"\/lavaderos\/municipios"});
return false;
});
});