SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9ed14c73d6cb686057652d592853e0baf61f0436e65e06404459a452ef86c4' 
  AND token = 'VOtBiGhtdJfLWwP+ZwTCCkuP1vYWlK1PefXwBhNKg1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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