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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0733a91002ed3b1cd9d0c725b3c9de88d01003ad8628202118d698cb43811009' 
  AND token = 'knENgwITG7fmJ5zKNt9X5Uk+7eF7GM7X51DnLi472tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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