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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cfca2b47ae02a04d639e4d4522673d564c1d651f14f7e749a98d196915f4cd' 
  AND token = 'pSerRQb1Vx0W4KOlAzuE6d/Xlc72VKfhvsQLgtI8fsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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