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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f8403b53df5ddd71d36441d41909f1f79d48fe0a2cea4afd5242c8efaf8d08' 
  AND token = 'zthbidzfz0g4xOxAd2/DJhTm5imt+5FWmNMPAmEhrEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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