SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f568f0e49c2c744f355102c538d6914f8f683dc149ff7248c44b4a455e07db' 
  AND token = 'Hd60FNL6CsTfPkwzhxQCqgxyAgfXYT4SYGXzBZm3hik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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