SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d25781c11bcd08693f48afa52391a32e76340b83d715d8815fbc9086d012be1' 
  AND token = 'RnVYHafN+/9pvIOebQ5zFsPX9qFhz6Q2B9Ccob1OjDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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