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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba6c53b56afdf52a7433a75bdc3b9e3c3ae628aac8885b5d1afd80f44d430bf' 
  AND token = 'YmNcA1eSY6f+t1faogCbHmusn3uOZh/e2Xs19+22MPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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