SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ed4c0b362f0fb1e37381389fe7982b7b1c777daaa246a4194593b8952d9637' 
  AND token = '6Z8oiFLFLHqQdMJOYyc8hPUPmhmz7CK2h7LkiA+UbYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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