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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7574bb5a34f03ef06ef5cb4ca8d2355742d54cd63e9669536ae8b72f07f83844' 
  AND token = 'kkkbqC2T5TtmcPuuIrPYlJGJ2pHMDs1fytqluBA+ZJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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