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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddf39746f2d7f25e41d2e09971f4979309f349f948767b37a433ce7f2e5e0a8' 
  AND token = 'aK5Pzl5mTHEz7NfTLmUSkAiWbWdiDryG2wQnVxJw6Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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