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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367857ec7fbad55a3ebfb8671131c77f3c2adcd6af150235360ab38e4a8e1cb5' 
  AND token = 'WFiv5k8ZrRzqpsnktxMHzl6U/3G8LXEo3xPz+DIU8MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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