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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0930cbeb912a9d0304847b6d6927952324b8b1deacc24adb69f5a37241bfc845' 
  AND token = 'qJDaLaWC2bNZYyWkFyeOpvmsQpfnZXplbPDOcOK3qxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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