SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf6165563cfb81e83fcc1a8d1efcb6d95d390b3819d412b7fe416f67401b6d1' 
  AND token = 'fBZjfM5QJr0xQmOSgHqzDqRKef4caMUZUuV+/xb9Xj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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