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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf8f60fcdec7cec5c77b71c041d72ff3ff58711ca08d500b09875ddf55bd673' 
  AND token = 'StEVc7qqUhQjCs7ydox8duhvkceV2Jfpq6rYxh/GT24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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