Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e033431a3d8f1393827a38bc64e8c0f4bb8ccc4d99dee3fffeff21df476158c' 
  AND token = 'nk6cGa0FDa3FOcQ+hOSjBNh6pyDtchoKLnXSmevAa2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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