SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016b756853d010c38d8078176575efcc60116c4a65dd356972c3a59fab186554' 
  AND token = 'NQwf5Jgq7UZQWNad2HGDwQpg/5zwhqmpQWEZKxy+JqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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