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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c69e0429a6f167fb90a18ca5c9ac5cb1fbaf2bcfff9f1b983c1585628fa366b' 
  AND token = 'gk8uzhN9dhsexeFFngGyX5ZhWSD/hatcbrJvGeYoRnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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