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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7ad6010451ba10eff1b1adbe3f2a36fef65d84cd68034b0e0ade3fa5f0bdda' 
  AND token = 'KAfOlVk9HoJzm7ctCyBTQSLH7mFsmeB0JDu+di+gW6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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