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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0dcaf6acb12c506a5cee49fc31fa567d819ac12ed1a8a4e8f7efdb9a313ae52' 
  AND token = 'Dm9cE4j/V24CZg2nPqs5tvdQV8BugmLRJn6Moc/ZdsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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