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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b2f77d92fd84d9efd7331d9bf78ff164d4c646aed6ef8e61f51bb0f85e8c76' 
  AND token = 'PP+7U6cZt7fZvWSznE/XaPD4SmGGC/zYsn/YrbAkELQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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