Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3016cec446c3c92fb30099ebec4cb1e472b7daeb62fdeb6b082107e4974f65' 
  AND token = 's+0iAatUYFpSrNe1UlKk9CtercLZke4wq1DqEEA0/64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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