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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5480e48a39a701a61249542af9670cec432b2269e88d870d0f751d986a07e1e' 
  AND token = 'WaPAYFtTr/Ux9lWLYyM6DBIp2Alt2aemUiXa9A9r7b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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