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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd832a9e1d5499de9663aff98c92c5d8f148a5c6618cfbbb715d0633e4099a9a4' 
  AND token = 'ORi62ohNlcc9FbPWkwgp5T0F4g+UBLIuewOk8Xac+Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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