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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1195eb1de998ef918318b901a733f53b4dee6bd1c530579c0f21544a205ee91' 
  AND token = 'iaU8cVw1248cAtpsnVbt6+TaGdC+0pKJRY0yTUljGqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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