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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c6d8c69f740360596f828fbd8dbfb74a8938a4d76da93783da7c9b6daa9567a' 
  AND token = '8N/nTV/Fwj4qTpF9egoCROG1nvH9eG94Kv39yWH03nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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