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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829a47c1ef7577b2ccaa36bee801856ce9b489bd2dcca94d943d0332ce28f0dc' 
  AND token = 'Bxc782taorznVDJhqi7dkhl+SkOo3G4xILrvQVxMFYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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