Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48333e9671c10f79f6eb61559739f1873f498fd75a4afdbe4ce29f1b89a404d' 
  AND token = 's4kih0D2tGh6tQApyHkUoOtnKqk8bk9jZx8uwyyMPS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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