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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c368804fbdc5a8a8756563f37d73c13d098c57201ad0c2a9f907ca1bf6c4fb8' 
  AND token = '6HBeysZZ8amls4AoCRa3lMbibD3u6mwnANSrcKWxcIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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