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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d1ea0406bc4e9a06402708f551a5ada877e019d7e63adb86f2f6d10a8b2203' 
  AND token = '5+7khN9u0DXfmt67sx5wp/AKSZpoQnXKx6BBpn7A2WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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