SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9352fea9d71d3ae094011f55de35d238528e0c768fc9c95ea2aed220704012b5' 
  AND token = 'j/bTQuhhSI7VKzMZvfZCoSCN5XgiVBgpnOvl3lW14PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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