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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c3ffb428045225b1026689edd6cc0aad159646930b212d97bd2765d656e208' 
  AND token = '/uqtuUQLNVEke0jRRuYmR7SLXCu3Xu8jAjHVnjM/9hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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