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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcfda2ad8e0269e3793c694519229e6be51869300ae3f52a96c88afeaa3632e' 
  AND token = 'OkWjO/vhKBe2+70YfyH/6WJemww04HNXhpuW0XuowLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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