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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acf5bd7b41290d76ef9433e6c41e87a61ebbee8471a9d8ea25c0c5cff0d36eb' 
  AND token = 'UZnCF0NDkXXP77IR0Z3xjES/l5EbENx8JHvlPd1IUt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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