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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e96c604a43cf3a850226e6701ba3e38cc57e57b97a35fcf5ac9b35e1d5ae48' 
  AND token = '3xqVOLGcLvXneuDXoZB46PDD9dninGwUiCARB43hZaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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