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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b8d364afbc1add0ac94c7dcce02dffe1508c43606ece804b353fadb78b0ed2' 
  AND token = '0cqKHe4aOR08JH/B4xqj3cq46g/RvPn/XSEV09upuGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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