Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3516d553d67ef73b87bda79e3ec4d4984eab10a03cffa9a56edebeaa7c00b13' 
  AND token = 'LbWiWYFEUHGjR2KDG+jHfyBWL8/TOHV8sO4UxSacsTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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