SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3c9c802b339bde621b15282409b51568c2339f0f3e9df7f10d2dbaa26f6927' 
  AND token = 'DAWktOqD52e+gKSmuM/L2jxp/zZEV6mCfW3g+9nrv+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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