Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a4347db568fc905be36c91f6549583c31ba3ed1ae3ae4ac151b309573ff74f' 
  AND token = '/jujWryq5HAQqH5tQzB7nfJoYehjVqGVfxofnberYeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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