SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35006c69ab1384e5fc81c3b8a6edd14e09ab76e619751e6e2b3dbec905a454ba' 
  AND token = 'jfGGBD+KSUFGLQETKGMKFTHjBL8imigDVhuIUMYoZYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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