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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95d90560d5ec6e9f0f287c8f3c4bb28c41e0996854d79531e747d4934906f19' 
  AND token = 'sZj01QwN+Vi55Lkym5NjfcSilHYQL6DTNaGVK+vmYHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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