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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c6653d2a670a994f85852f7e1bfb1013b1baf1b5235ff1a47f85672db6b56f' 
  AND token = 'eUyD1aJXTihdxWDUVKqZqj1g9ElRmXHt86JCVfOk48o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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