SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f1e62fab9bec254ead69cf776bf01d706b9f5897f7ced2bf82f394c653a1b8' 
  AND token = 'qwHIvJqqTgmr1VCSk3NIyTyR+jVuWH7U3F8W1yUzK2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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