SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e94870a498d95aafa45ec0d2f65d9cbb911c24a2ce231094cadf718f92f0a7' 
  AND token = 'ZJK5rW6Vlt3zv0MajzjhZPlf1m1WTYKugOyFQJlFUZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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