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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3cd7cdd29552915e2cd1a89fe7208ba840fc26161054a4ed9115dc1cd09cdff' 
  AND token = '0oAZ/FIm2BZqsCkcZjbfWpjG6A3pOHV5is2neGdCQMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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