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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39561b0c5fd99058ff836becd9a6ba934ae4405514f22d37e256705773fe7c19' 
  AND token = 'yulztagxKy7C2Ua7fueKOHzN+frDE1c/2RsPH/KzFsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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