SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea94e909b95d6a167573d51ceecb2c5f838d732468b715649e0d40d1a286f5d' 
  AND token = 'pu8AErKD/spW+7KQQ3tEnvqEGNgLLwj8uHdyZpNX6K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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