Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6b0b9e9280e66edd683964efe42476ac58bdc93f8c4e9d7426ebafd0e991a9' 
  AND token = '6pjmivNCWaKWQkWSpAQRpKBhkwx+Plfnkq3nQWb1rMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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