SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9069203ab87f411c16f1ae88bd6c6f7dbddab3e6519f47152de78bfda11dd72' 
  AND token = 'cZX7+nQvBVhsFwZnzrmkbhCPSxoFYtojBPu1WuyTqVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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