Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f98f061e2b05486e8caff278f08e115de5a8eb847be7ab8da2cc6f6231fa08' 
  AND token = 'rr1k3uKdlK0Pg1BmuhIRZOsQYirM8SoBEHj5M8JCB4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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