SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07153c9bb20b2f43b7bcc177aff7b8a492dc48c769c1ff22db955be96c98f06' 
  AND token = 'sjjxdQTQpPZ+5K+vu385MqDSAnLlJi+hLe2aCGPGDjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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