SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ef695fab7fb984eb9f4148bd263590cfb06e797d5b58acba2d28020268bbe7' 
  AND token = '8TimI4YjTUY/NGU+thhjhQqzexwh1lvD8ZzOdxnZXCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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