SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe26faf7d7db17fb45a14fc8c603a9d4d306bff7e663ce6309de0c3d3bb3690' 
  AND token = 'QZzSwZXbW1FsXUrkoFvDfD81pxq1MhggJu5zhhKJmZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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