SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fdba8328ee6d205cbd9cb3c7c5adc167e28416599693c3e9a2bc601ee6bbd10' 
  AND token = 'ovWmojY3/hXWCVczXeqnAgO1YWBCSmJ33k3J/wh6HKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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