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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9401807ccb54b1728847ba5fbac8491f89ed57bf1694728b2b46f1d978912bb2' 
  AND token = '2nBnHBqgpqgUE/vFTpT4roWuXJbMkhVaK2MzpJgN9KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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