SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1dc6fbeb79c62df262fdb81b843a7552dccb5321e3bf44247fdad6189f6ed9' 
  AND token = '0KBg42Mzh43HhAYIh7bU4xKRAtv2yLIYIj2vJFGmknU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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