SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8f06c587597d7666d1d34dd31a98e68cb2e889921c3c87645420fc4bf59fa8' 
  AND token = 'RRwOCIAkYyih1BXWJl6gYPhTU0ySf4AvaWIqJaXnJFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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