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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7997af04032aaad7df92a613e5402e9140c514dac683f688bd56f2a5cdd25a4' 
  AND token = 'Iu+CnHQkOTeA2hL6ikrPr00jRrnZOcJZx/yB+2Y6IlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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