SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d9d6d25d18446c6d873cf781f237fd56cdd40c75ad40bfad6357b650c3c875' 
  AND token = 'voZZONjc//LaCzgHT9ulArvGJMGo3hzCXUaZmWfvbaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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