SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeab73edb850ca2137158b4efc42a386b12b96471ed59c6608793daacbbb1eae' 
  AND token = '6NYpYvz+TRGYWlXuqH39opcACAGWFKh3OqvrVhRyLmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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