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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3961c941481326f850b049f7019292a2f64265b9150dc56ac316e16910a192b' 
  AND token = '54L80LwNkSjJjDJmrAOSPeCQnvNF6EdZiXdIqNZKKes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00235

JSON explain

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