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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf77458fef8df7f6dd8d46f8a9a81f6ebe0705df5ee66852abb98f655cbbbb4' 
  AND token = '9Tusti+JKWDJhy51AHoeaF5xayIZnRyIoC0RWcHidl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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