SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c69e0d121240b39eebd085ae698717c5f07312f93c2ddf831b202d2f630f8e' 
  AND token = 'yASw8F1KmZnp6wXz8+b4hFNSQzvlIziow2s/X5jgLZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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