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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240ecd5a087a6fdc93fd4dffc6f37c0b6cbe76e3d290f331c0c48d816d0fbfb2' 
  AND token = '+QKUGHHnPO+nRwkGpWRVQnh1sldG+JDPxUf+0lVh0og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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