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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2301089226626b4e9821cd6c70c2e747294afff87fc51e9d2adbdece0e4719ee' 
  AND token = 'AS47fDh6IN/C/iQzT5sSdIXZYsv5LEJhSvt9tD72wos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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