SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb54b80c68c283fbb7e3653697a91c60d90462caeffa4621ab1b8fed7acb1c0' 
  AND token = '/qXGsxYK1kl0mCyVkjMKJFxUJ8vz7fblWlWxmfG+6xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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