SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cd69fb7df19002e7d011d3b5d25864cac228df97413ebe8bf411baa7366a82' 
  AND token = 'b1DYcOXlIUvq5HB3R8h6fs04DoHJQf7WZLzwBTO0F5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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