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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfb8c824a41d41ada93b1aa8a147a20f1d9cda97109ea021dd4cc0cbfb93dda' 
  AND token = 'ms8cMyTw6Sn/comJLfwJlYXMN7mxsPQGbOIwWAK/WC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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