SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f4acbab6d7b930a02113344fdb505225fb8d35f42cd8c0069bf8ac56f1162c' 
  AND token = 'kQ7bYAwhLlfHUi8c5XwURLgcGm+HePJ67/lXNZZ+514=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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