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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733e6a32918d982519e2c5f5d2491be7c1a9809b8fc6ce8b729fedefd4885aa9' 
  AND token = 'jpUu2RRxv5VefqrDWCfDmtE0kHIPgyiDu9pRgph5yuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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