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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd2f8b965f1e41ea33affa0a2b7b8fe10f1d6f1a4ab2ccf2bb4621a17ee8a10' 
  AND token = 'jLNKuWs3sSe2B/igvpN2wVoi2RSKySHr5R7c5UJ5JpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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