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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62cb679dd6df12f6962a7b91b5e76c2333c2fb1170b268ad007887b58e43889e' 
  AND token = 'Yivl9+xqkgnvUg36GZ+f4Q5Rxf9cKcn80jKlqicbggY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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