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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4541d036f4434448756764718a768e4443dcf01932e24d5cff12f011e85b7315' 
  AND token = 'TgI/4Oey22RNyE8KsJSr3oRxAmTwTP+540snCkXwTaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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