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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca42f56a982730a486c2fc586167714e0533c8c93264e368c5d69eac2f26c82' 
  AND token = '0Tx/zC1TcPFdaWz8jxvcwvDD+oEvLWPdCA8qFHFY9UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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