SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5ade3fffddf4985a32f7d2c0990c6df87a8992f84f04024de271b4fae2c86a' 
  AND token = 'VKjXD8RthDqwujVcuTgCFNnK6h6GSTz4smGDGwovffg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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