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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0823b34cee91bdf1f0588ae3a2176afc40b3c9a58e0977ecaa972d5357b9be6f' 
  AND token = 'Ow9Wz/7m63DRg8EhUkcDkyfh4xC1frm8zxhqHtwvTp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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