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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5952d9459df1ead2c984ef5420fdcc3240e664dd9f037c3aa89e8a6375aeaa' 
  AND token = 'Hy8Dd+b08RiZ7apbISJHdnJOjHA2je9ooVos8tz9cvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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