SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c901b23efd9fe7077b192567c61fdd338665a0ef7b9e11b617671d2821f6c073' 
  AND token = '8ziWCCAQYEHvd2PeB/WKZCirQGYCVKIayRPH/Bwpv5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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