SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979b96c74ca32d12dd5b0dca164f21ace3702b324d2989238605df17f794482e' 
  AND token = 'huatKKhzsTBae/FOSdUV3lSGZzrhPDnqn5gqRGarcMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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