SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf57046b749b5471677b1c1e39a72ba0a750a14785be831e5c268e62ed6a8aa' 
  AND token = 'wuLhgaZxv7I+SJdssBB1qen3mjBbxQ8K8A4zj5ZxGG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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