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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe5ece688876bc986a8d89eb92d30d192e2ae5231bd94f56a7fe9ebda6ce672' 
  AND token = 'kmHelrY4yIFsY8/DcIn/xj4OkfmpeU7An87jJ1+jHSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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