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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e3b792ab281fae8f115b43f61e2e2fefd742ce3e125e52450a6ad7913d64d7' 
  AND token = '3jlDkcaGIIpIsd+GYzwIsI/FVIU9aUH/UhIxo6d8hFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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