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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44758e9598c11642298014b8d8a11d9e9fa853f7f0480583730a6fddda2f7928' 
  AND token = 'gwY0SHM3Py4ydXJYH32mGcDCkFDC1qgkrMYSWU4XymI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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