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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973bfb3ceb334626bc26457da50f99cd57fb821ec6ba52d6741b8e33666a394e' 
  AND token = 'ZPYfoY8ss9At6tUrM591btB7DU90orVpUYYjc2t3Kfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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