SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1539df8383f3c932b82b5d3a96ea9e3545da0d13a05e7d72064815e8fdd20b' 
  AND token = 'FwcWrZco4jH2TC1Q+bD2wyVp8khFChLOYTvgeDuBQto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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