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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447ab96cd71af1a56d498dba137b1dba7d0ff009477fd19fea9a84990bff7c51' 
  AND token = 'XNUFM14GSoQKOaeg1LJNmOEntaN4y05LeQXlKWy1BvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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