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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fba5c3463b47e6230732f8bf3ee9c76b6bd247d164bc6f8593fa12b3a2b62f3' 
  AND token = 'wl/7nPj18NPXlbX6qday1Q+WhKczEa8B+E8KA1M2Ids=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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