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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa87bee9ec8d20bf24b9d9ed379bb371d05ff34ecf105073bc7c7179844c916' 
  AND token = 'Yk5176ONZCAeAdJbHJpn5TbIUD0CFQsck5hW4vmRMyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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