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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9321443728bbd11bcb9a97be9df87154395e0d6e48418833ab52643ac53c15a7' 
  AND token = 'jpLGKeJpUyX1gzsh4lgcjEqkZitEEFCVINn0J1AGn8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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