SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae95769281113cccfb7de384b1da855a2f651f80f4fdaa9aab21ef1107758d43' 
  AND token = 'b03sBIbnBEa4U/POPe+iKxgWIm0bt8xhBNhq/ThEPP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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