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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08adaec2cbe9bc456eeefdaf3cd0d6b3564accbe273ad9ac9a9dbfcf9ddf4e3e' 
  AND token = 'Vzf3ZGY0Av0fwJYc75RAtCwO59V8JXrJq6qAsKHbQOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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