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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598f455e95a8b1f9ced9f2c146a486ed9b50d59a6e2b69b06907a07eb371dbf2' 
  AND token = 'v4leZUcy/PD881rmKgii/iZnCcDb8XQRvX6s2oClSJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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