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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4a36ef3841982734ae508e56d2d8bef2fe21d67f2830ab70f7e0043d6aebd6' 
  AND token = '+wEzcgKtCRugqXe94QlN2SdBYKoTPfCg/411Hj/rXIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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