SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb18237bb6c7a559d9a5bacc38c6e65a36ff0b38a04e853793810121af47e8e' 
  AND token = 'KZTFJJ0GGxlOLMBf7+vVzPZ+C7Mzku2C2XxUUuneW08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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