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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410b002c65fb088c27faa73698729c92b2a4d5c7d589ae8d5381ec818a0bd958' 
  AND token = 'Zf5XJy/3KoHwRpVCHAfNaSrvOKIJ8aIkFmhW3S6ChMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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