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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bf5348f4f0928a062e7c434fccf2e32c536cc1e7730c718e5a28b8d8fb7e9d' 
  AND token = 'TColgkGQyOu0obJj8MV/FLP0YQ1yl8MvbVuU4Bbt4k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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