SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01d9400eb84d35d43014f712e07b52bac4925bbd230317998e8c834df688571' 
  AND token = 'yWuW2G2yLjN2U+d6pL9Kt2fOFIg/thHJ1FmKpfwmB+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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