SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c088992723538025b40cbc7421b48006573e53a711a658077e638fff6da6e8dd' 
  AND token = 'Sd1KJhQsIolfzZM+7D+hsjdspdYxVbfyEHKFsg3brTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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