Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1fe6d92b03d465fe9efe56884757ff914d21c3e17732db583c4fefd95ad2edd' 
  AND token = 'xHs/JBzHa98gB3ruNyr1SYPW9eQbVgBXejAXkL1/6Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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