SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bfc61e8c34603157c8565f04f11f4419094a95c1567f210e0e0193ee751489' 
  AND token = 'dWQ2/z+1qjJ3ti2F2jxiC9LHjLmW2K4BgJowRmQIDxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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