SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4172f95eb64e590bdf80836135b16bfe9fb304c772c5b2d63f26d55c8eac7c99' 
  AND token = '9w/VKWlQWIZ0OmmZw1KyDqghsaQcuogxnwxLwggeyrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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