Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac2a0a81b8c8841fd00a3fa4918b0817b39738a0450edb951b5fec3e7da339b' 
  AND token = '4S+HTk7+RYMw/QF1m2/FsHNhEJdshs6NgwU69jf8pVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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