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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1b8ecbc0cd36c4737c58c0df6fc5bf4d4ab9cef75b54b268825906a484f693' 
  AND token = 'KTaElj8jzmsXwx3ldg8SOj4OelBjUcvvN0ZEqL7T96w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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