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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '395700b982ff06d350a1e4d40fb7250b6349944da9faaa66bd560c8a61d41e5b' 
  AND token = 'Fn8npq9YiRqjtBiauBkbsmzwYqQ9zIhohtTKh1m9GNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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