FormKey.php

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<?php
namespace Magento\Framework\View\Element;

class FormKey extends \Magento\Framework\View\Element\AbstractBlock
{
    protected $formKey;

    public function __construct(
        \Magento\Framework\View\Element\Context $context,
        \Magento\Framework\Data\Form\FormKey $formKey,
        array $data = []
    ) {
        $this->formKey = $formKey;
        parent::__construct($context, $data);
    }

    public function getFormKey()
    {
        return $this->formKey->getFormKey();
    }

    protected function _toHtml()
    {
        return '<input name="form_key" type="hidden" value="' . $this->getFormKey() . '" />';
    }
}