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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a826d9d46d9d3001d4ee1e056b635ae080b5d9038957d259ab6eb8f8bcb794' 
  AND token = 'FutBqp2WMC6+iiizrqYFoOkOzFb8jSO/e7fHr9RzqCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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