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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab1a5fcd62048df448ccd3d8190d33da8fd47897038a8f058e95626e71ebf0a' 
  AND token = 'Sn9GWN79jJzyei4Hk9zRemlm5T2E1qoavc3AZ+lLg8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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