SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34e7149d8fb39b0826d7c41761f18bde3b7bb89d53b367462098879c0567cc7' 
  AND token = 'Pii+ZdvWEj/l+VnOBxDvZbJf+8xXC6tzYyj/Qb3r9XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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