SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a213d93cf78d681ebad1ccfc1d9c7dab686a6852fa73f815c47989f437c453fd' 
  AND token = 'YOZ/Wq9s3nZTVqHCkUemQZUifkQLU4mgKLoaG7jc+KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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