Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d69a75df7bb69acb9fc82609792d5400f861242ce0d58f94fa023d9bc8199c' 
  AND token = 'DzBXwaDA2fBUa4pYw1++PcHT2/jjDFzaygj9OeBEMGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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