SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2b1562483211345b97a37cf49f36bf91ec4c179ed6bf94ecc2b007e01fd510' 
  AND token = 'VPxTjRzLXYFn09iPyIq0y8QtgHKhJQFlJPMajpcOXC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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