SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015145d2a6326f89c7f9ba37a9ea3abcd4ae9c598b54f2f441ea7e981f943f9c' 
  AND token = 'hArSKVDG8wgsNQ+YXvBDkB3HDm60KdXKR+b5m0xuNG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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