Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e68bcf0971c31ac03df9de5d402abb27d55df1d60137cb24220c15e88ebe86f' 
  AND token = 'tV4IrSQdsJXlPPT5LEdc10TIwzKU8kGjLAi+YiJEgzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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