SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0ae3eb07d973f44cfdb000c777881ead140e3a6d72b850c59c7b5ff4f9fbff' 
  AND token = 'CyTNIhZB2UJfqek7SOwu6KU+lXsERYGSXoGBjuBWIIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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