SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0117eabf9c23ab9e2985be4276d1bc4798fffb5395b27896e29df146208ccaec' 
  AND token = 'rATH4OMFkduhbuz0yX+qAd4djSOrpWd/KXWHffptXVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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