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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed45808d80911d9f1286048a8b4adbfcc4ba7d7c6044280d01e9427a373c871' 
  AND token = 'Q65IdBYxGzZU1pgKMramWpL11L4FWkcEC+9W5Vi5ps8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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