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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2724add0abdbe3e7db4c7de58bcdc0e733b91a606cef344c1ad0fa1ac12fd358' 
  AND token = 'vt1GPFtrMxLW9eB2Ziq5X8fQ2/4h1C/c7XiLQaHM7MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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