SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33c896101e3330a98d8e0d2bf75de07433f175fa4c2cab78fec5c4ce7e71ebe' 
  AND token = 'whhzruW1x0Y6+gUruuiMIKnhGBZdxZwbKJQ6q5Hj5FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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