SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdacab9ebff4f9d8f5f8b95df7b3bf571b9214d51f03c22594b087d847476da' 
  AND token = 'O12EnHRthpsFKcrawxv/0R1fGAgZ6z8sTqAfV+Tl5pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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