Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc20f573019fb47d0b6d6b7df4a30364965dbc6ee7145f748e0671a09c5df0e' 
  AND token = 'KbOrSQ7OoGKvsgTiB49O4zl7c+D16XxB1kxtIo9jq0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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