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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdc2e12b7baff7d73ed777bfc6dd553278ad9a25e48ea2e66fb87556f1f2843' 
  AND token = '5UCtqbn1ybvXpx5ri6FDEDK+uXsAjvAUomKbVYjQMHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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