SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032b7535a525fd174dc49808d53f995b075528d2b03486d627f355097e5c765f' 
  AND token = 'oKfQ1O+5JPl9Rs/mIYp/hhXxFGdqzPw4gXGYJC7J0F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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