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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8749f17732715776615fd55946b5f23b391a3d6617e8f896da447b665477e6' 
  AND token = 'Yfp6rSvrjuiaUyIpDlDY5B3nyhskGp0euWgWman5yH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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