Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972b03b75fb1b21ce09a6fef5be27985ef8fe738a33a9bc211bf9fa5dcb38e7b' 
  AND token = 'ZVjevHSbrstTzYXlq3lB+SRe6Xb3eJnYUFeWYAiD5rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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