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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca0ebf1e7122a1d9b81cf1036a06013028c1af80070284ad2812f16a6545017' 
  AND token = 'sBqKRJary6oCcjLRC96y2qJ4t5GxGwlA8Mu95TgwY7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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