SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01898cb31425396fbbec621b1abbc8362c835b2f643c52bf0d3b9ef26797da32' 
  AND token = 'OEM1hQvh+J+sAL7djHXHoMeq/GKeVlxKRYex/GW1t58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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