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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9829d557b2c250185d9b3e44bbacbd8e003f2e95dcb143beba4daf2b61914df' 
  AND token = 'BXliq7tkJa4N8F1aYD1F/yecJ3/hU5OSSjZct2NtUMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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