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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296bff53555271d816669d0a5a97fcf2dac8a0e80cd019b3501837e2881a7874' 
  AND token = '1PNjI+UQrF36CRv63v3MRx2+vHxSMSaAnvTTAJSM9h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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