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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91d9798280d86e94c26ed5b7ef1c6d6b2ddcda32f7c113064971dde9bd2100f' 
  AND token = 'y5byB/lwIKk8woLXBVCZL5mgSBkmg2QZHpReGtH24fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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