Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751bd9bd83d30feb10bc69149d8909daa544d5fa0eb12c6c27ff86e7ceec13f1' 
  AND token = 'LPEJFtXQVQS4oTSwZeHZuhJdZdeanOdIyGWXyV20Deg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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