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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1edd6fd132cec6e8c9efaf86324c18a1beda349dae95260f91a5575821be53' 
  AND token = 'gX8JVNS7Op3k8NfOV3OT7SJFWn9Zu4BEXo3hUwM3MVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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