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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903f8d93e26b06de88fc3c25ffb44ddbb78853f06a691de91c008087f114b47f' 
  AND token = 'vwZYU5jB6C870mxtpvN8sWuBrj17LJkmYCUD8iaWu+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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