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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ad2873159f8b992d666a04e73f1d31b836d83bb8672cc4fb2f76c372a61a33' 
  AND token = 'NJi/D2pRI48zjlJawq6KkuxdTV8srkhwCbmrrV5Opl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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