SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb31be6e52590f9881384b7f7a6076485a17f386fed271156a933051b5d1f77b' 
  AND token = 'C3R5e3l+bif3Ws2jqoFjM0rXWzZIVqgHR5KlzaVYkYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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