SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d7c19ecca0c6de85d9fb2339b9d40f554c7c8a68f3392c867a0ac3292a864f' 
  AND token = 'hhjEcUjszDvw6pO4XRSMOk7nIYahXosVkAAyAFl/GJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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