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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274a4cc12333612c7c6114f5447dd48b3cc2d2b998640a81c9748aa398b79a78' 
  AND token = '+rmFnpyehqDbBdUUf3Nh0TdNY36/jhdwfxTcuJQi6eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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