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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a96d58b1221febe48f6c47a3ca7c802b005483bada788a71ef20e7618ed9c6' 
  AND token = 'uuCHAfRa8PnBD4KcN0jTUJPFx9GIRa9cFsXMK/vMXyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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