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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a03f8ac5c9249fe9cb9df1e732dffd84aafc245f304a8c93710e73fe6f99c40' 
  AND token = 'sHh8ZUSY30hx81MRPD7PNx0TNFOSOtkFtQfKl9W72hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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